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  • 1. (2023七下·清远期中) 如图, , 将求的过程填写完整.

    解:(            ▲            )

                ▲            .(            ▲            )

    , (            ▲            )

    (            ▲            )

                ▲            .(            ▲            )

                ▲            (            ▲            )

    (            ▲            )

                ▲            .(            ▲            )

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